Thickener Operation Figure 13 shows a log-log relationship between underflow concentration and unit area at various interface heights for a desulfurization sludge. This graph was made from the data gathered in the continuous tests, considering the interface height recorded for each run instead of the inventory of solids in the thickener.

concentration (Co) and underflow solids concentration (Cu). This minimum flux is the maximum allowable solids loading for the thickener to work successfully. When flux is at minimum, we calculate for the maximum area required. If this limit is exceeded, the solids will overflow in the effluent.

Thickeners work continuously to produce a concentrated underflow and a water overflow free from particulate matter. These equipments are highly nonlinear systems, and practice has shown that standard feedback control has not been very effective in providing consistent operations.

Thickeners that are designed properly with sufficient contingencies and conservatism should be able to deliver the design target underflow solids concentration as an average figure over time, but nevertheless fluctuations of the thickener underflow solids and flowrate are inevitable.

The objective is to determine the area of a thickener, the optimum underflow pumping rate, and the corresponding underflow concentration. The following data were taken: Q f = 177,600 kg/h; x f = 5 kg/m 3 ; and [density], p f =1,000 kg/m 3 .

Dynamic response: underflow concentartion From Figure 3, it can be seen that the level response has an integral characteristic, while the concentration has an over-damped response.

The effect of feed solids concentration, flocculant dosage, underflow density and other controllable physical parameters (within flowsheet constraints) will be examined. Compression zone data, important in high rate thickener sizing, is also gleaned from static tests.

Equation (10) relates the limiting concentration to the underflow concentration. Figure 4 shows a concentration profile at a certain operating condition in a continuous thickener. The uniform concentration beginning at the interface in this graph is the limiting concentration.

possible underflow solids concentration, is ... first paste thickener for red mud disposal ... will require feed dilution to optimize flocculation. ... Thickener Underflow High Rate High Density Paste c o n s o l i d a t i ... Underflow Solids, wt% Read More. High Efficiency Thickener - machineto

High rate thickeners are designed specifically to maximise the flocculation efficiency of flocculants. They differ from conventional thickeners in feed well design, size and control. Unlike conventional thickeners, high rate thickeners must use flocculants. The basic design of a high rate thickener is below.

Static thickening tests will be conducted on each distinct sample. The effect of feed solids concentration, flocculant dosage, underflow density and other controllable physical parameters (within flowsheet constraints) will be examined. Compression zone data, important in high rate thickener sizing, is also gleaned from static tests.

Jul 28, 2018 · Deep Cone Thickener - Gold CIL Plant. Deep cone thickener is a new kind of thickening equipment, with the obvious advantage of large capacity , high underflow concentration and high automatic

Waterex Ultra Hirate thickeners operating in counterflow are capable of producing an underflow with maximum solids concentration. These units have a smaller diameter than Hirate thickeners but rely on higher side walls for maximum underflow density.

18. Depth of Thickening Zone as a Function of Underflow Concentration and Suspended Solids Loading at 15.0°C 46 19. Depth of Thickening Zone as a Function of Underflow Concentration and Suspended Solids Loading at 10.0°C 47 20. Depth of Thickening Zone as a Function of Underflow Concentration and Suspended Solids Loading at 5.0°C 48 21.

Paste thickeners thicken tailings to higher underflow solids concentrations than conventional and high-rate thickeners. For example, a tailings stream in an iron ore application could be thickened to 45–50% solids Newtonian slurry in conventional or high-rate thickeners.

The concentration profile in the thickener can be predicted by entering the solid feed rate and the required underflow concentration into the software. But there is no reported software for controlling thickening process.

the evolution of the yield stress vs. underflow solids concentration for the two deep thickeners operating in parallel. ° Deep thickener A is flocculated using a conventional high molecu-lar weight polymer. ° Deep thickener D is flocculated using a blend of DRYFLOC D and an anionic polymer. As can be seen from the graph, the mud pumped from D ...

Jun 10, 2015 · Thickener underflow overflow /flotation slurry pumps . or the abrasive strongly and high concentration slurry. . environmental, etc for transportation of abrasive solid slurry, such as metallurgical mill pulp conveying,.

Paste thickeners thicken tailings to higher underflow solids concentrations than conventional and high-rate thickeners. For example, a tailings stream in an iron ore application could be thickened to 45–50% solids Newtonian slurry in conventional or high-rate thickeners.

Paste thickeners thicken tailings to higher underflow solids concentrations than conventional and high-rate thickeners. For example, a tailings stream in an iron ore application could be thickened to 45-50% solids in conventional or high-rate thickeners. Conversely, the same tailings stream could be thickened to 65-70% solids using a paste thickener.

the evolution of the yield stress vs. underflow solids concentration for the two deep thickeners operating in parallel. ° Deep thickener A is flocculated using a conventional high molecu-lar weight polymer. ° Deep thickener D is flocculated using a blend of DRYFLOC D and an anionic polymer. As can be seen from the graph, the mud pumped from D ...

Jun 10, 2015 · Thickener underflow overflow /flotation slurry pumps . or the abrasive strongly and high concentration slurry. . environmental, etc for transportation of abrasive solid slurry, such as metallurgical mill pulp conveying,.

Jul 16, 2018 · Thickeners are used to increase the solids concentration by sedimentation. . particles to ultimately produce thickened underflow slurry. . has been developed by Weir Minerals to help overcome the performance problems associated with.

bed volume to produce high underflow densities. Over the years, this thickening technology has evolved and refined to consistently produce non-settling, non-segregating underflow. The improved underflow density can be in the range of 10 – 15 percentage points higher than underflow from a high-rate thickener.

Some pump types struggle to meet the demand for pumping high viscosity, high density product in thickener underflow applications. Bredel hose pumps are designed to handle high solids content product (up to 80%) efficiently. There are no moving parts in the product zone to obstruct the flow.

The Thickener will calculate the liquid split to the under and flows to satisfy the user defined solids percentages. If there is insufficient solids in the feed to the Thickener to satisfy both the under and over flow requirements, the unit will try to satisfy the underflow solids / liquids requirements first.

Clarification (Thickeners) The principle objectives of a thickener are to: Clarify water for reuse in the plant; Thickening of the solids. To design a thickener we must know: Total feed volumetric and mass flow; Identity of unwanted solids in the overflow stream; …

Thickener evolution, type of thickener and resulting underflow solids production is summarised schematically in Figure 1. The importance of the relationship between underflow density and yield stress in thickener applications is illustrated in Figure 2. Figure 1. Thickener evolution (Jewell and Fourie, 2006). Figure 2.

Underflow density increase enables slimes deposition to be maximised. This is a very important factor for both Tiwest’s operating costs and sustained operation, since the water lost to thickener underflow is evaporated in slimes cells and lost from the process. Tiwest had …

meter for solids concentration. With these equations, the unit area requirement can be calculated for the desired underflow concentration. In most cases a correction factor must be applied for the height of the mudline or sludge zone in the laboratory test compared to this height in the actual thickener.

During Continuous Gravity Thickening 12. Pressure and Concentration Profiles 42 13. Suspended Solids Concentration as a 44 Function of Effective Pressure 14. The Relationship Between the 46 Superficial Velocity and Pressure Gradient 15. Depth of Thickening Zone as a Function 51 of Underflow Concentration and Suspended Solids Loading 16.

Solid concentration range in the cake is between 4-6% in thickening operations, and 10- 35% in dewatering operations. The length to diameter ratio is between the range of 2.5:1 to 4:1 . The solid bowl centrifuge performance is determined by quality of the solids in the effluent and the cake dryness.